lockd: lost rollback of set_grace_period() in lockd_down_net()

Commit efda760 ("lockd: fix lockd shutdown race") is incorrect, it removes lockd_manager and disarm grace_period_end for init_net only. If nfsd was started from another net namespace lockd_up_net() calls set_grace_period() that adds lockd_manager into per-netns list and queues grace_period_end delayed work. These action should be reverted in lockd_down_net(). Otherwise it can lead to double list_add on after restart nfsd in netns, and to use-after-free if non-disarmed delayed work will be executed after netns destroy. Fixes: efda760 ("lockd: fix lockd shutdown race") Cc: [email protected] Signed-off-by: Vasily Averin <[email protected]> Signed-off-by: J. Bruce Fields <[email protected]>
chewitt · Nov 27, 2017 · 3a2b19d · 3a2b19d
1 parent a3152f1
commit 3a2b19d
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
@@ -274,6 +274,8 @@ static void lockd_down_net(struct svc_serv *serv, struct net *net)
 	if (ln->nlmsvc_users) {
 		if (--ln->nlmsvc_users == 0) {
 			nlm_shutdown_hosts_net(net);
+			cancel_delayed_work_sync(&ln->grace_period_end);
+			locks_end_grace(&ln->lockd_manager);
 			svc_shutdown_net(serv, net);
 			dprintk("%s: per-net data destroyed; net=%x\n",
 				__func__, net->ns.inum);